Posted on May 12, 2014 at 19:02
Many thanks,
i looked for some samples in the net, but still getting the same issue, after re-power on, i still find the power off time. Like if no RTC time increment happen when power is off.
I attach my code, that's very similar to a sample found in the forum.
I am wandering if the time increment on battery domain is completely handled by RTC hw or some interrupt must be set.
uint32_t SynchPrediv = 0, AsynchPrediv = 0;
#define BKP_VALUE 0x32F1
void
rtc_setup_time(
int
DD,
int
MM,
int
YY,
int
hh,
int
mm,
int
ss)
{
RTC_TimeTypeDef rtc_time;
RTC_DateTypeDef rtc_date;
/* Set the Time */
rtc_time.RTC_Hours = hh;
rtc_time.RTC_Minutes = mm;
rtc_time.RTC_Seconds = ss;
/* Set the Date */
rtc_date.RTC_Date = DD;
rtc_date.RTC_Month = MM;
rtc_date.RTC_Year = YY;
rtc_date.RTC_WeekDay = 0;
//RTC_Weekday_Wednesday;
/* Set Current Time and Date */
RTC_SetTime(RTC_Format_BIN, &rtc_time);
RTC_SetDate(RTC_Format_BIN, &rtc_date);
/* Disable the Alarm A */
RTC_AlarmCmd(RTC_Alarm_A, DISABLE);
/* MARK HAS BEEN FIRST INITIALIZED */
RTC_WriteBackupRegister(RTC_BKP_DR0, BKP_VALUE);
}
static
void
rtc_first_config(
void
)
{
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
/* Enable the LSI OSC */
RCC_LSICmd(ENABLE);
/* Wait till LSI is ready */
while
(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) { }
/* Select the RTC Clock Source */
RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
SynchPrediv = 0x18F;
AsynchPrediv = 0x63;
/* Enable the RTC Clock */
RCC_RTCCLKCmd(ENABLE);
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
}
void
rtc_init()
{
/* CHECK IF IT NEEDS SETUP */
if
(RTC_ReadBackupRegister(RTC_BKP_DR0) != BKP_VALUE) {
RTC_InitTypeDef rtc_init;
rtc_first_config();
/* Configure the RTC data register and RTC prescaler */
rtc_init.RTC_AsynchPrediv = AsynchPrediv;
rtc_init.RTC_SynchPrediv = SynchPrediv;
rtc_init.RTC_HourFormat = RTC_HourFormat_24;
/* Now RTC init */
RTC_Init(&rtc_init);
rtc_setup_time(01, 01, 14, 00, 00, 00);
}
else
{
/* Enable the PWR clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
/* Allow access to RTC */
PWR_BackupAccessCmd(ENABLE);
/* Enable the LSI OSC */
RCC_LSICmd(ENABLE);
/* Wait for RTC APB registers synchronisation */
RTC_WaitForSynchro();
/* Clear the RTC Alarm Flag */
RTC_ClearFlag(RTC_FLAG_ALRAF);
/*
* Clear the EXTI Line 17 Pending bit
* (Connected internally to RTC Alarm)
*/
EXTI_ClearITPendingBit(EXTI_Line17);
}
}
Thanks,
angelo
